NGC 6559 (Alex Woronow)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: B302 · B303 · B91 · IC 1274 · IC 1275 · IC 4685 · LBN 28 · LBN 29 · LBN 33 · LDN 210 · LDN 211 · LDN 213 · LDN 214 · LDN 221 · LDN 227 · NGC 6559 · Sh2-29 · Sh2-32

NGC 6559

NGC 6559

OTA:……………….PlaneWave 17” f/6.8
Camera:………….FLI ML16803
Observatory:…. Deep Sky West, Chile

EXPOSURES:
…R: 16 x 600 sec.
…G: 16 x 600
…B: 20 x 600
…L: 22 x 600
…H: 17 x 1800
Total exposure: 21 hours

Image Width: 39 arc-minutes
Processed by Alex Woronow (2022) using PixInsight, Topaz, SWT

Finding the detail in this cloud proved difficult. Many clouds with active star formation show the signatures of the violent process that characterize the formation process and the frequently accompanying rapid demise of more massive stars that also form.

However, this image set made a good test ground for evaluating various star-replacement strategies. (The nebula was processed with the stars removed.) Despite various alpha-compositing options (many of which have blending-mode equivalents), the only one that worked well was simply copying the stars through a star mask. This corresponds with “B over A alpha compositing,” where the star mask operates as the alpha channel. (In layer-manipulating programs this equates to “normal” mode blending, usuall!)

The Astrobin version is 1600x1600 pixels, downsampled for 3700x3700.

Bla...Bla…Bla. Anyway, hope you like it.

Alex

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	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
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Amateur hosting facility
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Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	5835698
PixInsight job	X64SHFX7RVI20WVF1ZU7XIGCLJ1JDZZL
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	18h09m48s.44
RA (top/left)	18h11m13s.50
RA (top/right)	18h08m23s.50
RA (bottom/right)	18h08m22s.65
RA (bottom/left)	18h11m14s.18

Dec (center)	-23°51′29″.7
Dec (top/left)	-23°31′55″.9
Dec (top/right)	-23°31′55″.2
Dec (bottom/right)	-24°11′02″.4
Dec (bottom/left)	-24°11′00″.2

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NGC 6559

NGC 6559

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Image Index:

Contribution Index (beta):

NGC 6559

NGC 6559

Equipment

Acquisition details

Description

Comments

Acquired at

Sky plot

Histogram

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